Adding functionality to the characterize_data.py script.
Adding functionality to the characterize_data.py script.

Adding some basic analysis of the raw results from the
characterize_data.py script. Additional outputs include a csv file listing
duplicate images, pdf file with histogram of image sizes and
a pdf file with distribution of min and max intensity values. If there
are no duplicate images, the "duplicate image csv file" is not
created.

InsightSoftwareConsortium/SimpleITK-Notebooks,zivy/SimpleITK-Notebooks,InsightSoftwareConsortium/SimpleITK-Notebooks,zivy/SimpleITK-Notebooks,InsightSoftwareConsortium/SimpleITK-Notebooks,zivy/SimpleITK-Notebooks